Another Amps to kVA conversion

[Mudbone78]

I've looked around for formulas that convert Amps to kVA and I've found at least three different converters that give me three different answers. Here's my situation:

I've got an ozone injection system (for environmental remediation) that requires 80amp, single-phase, 110/220v powwer. I'm trying to find a suitable generator. How many kVA will the generator need to be to meet those specifications?

Thanks.

 

[waross]

Well, you know the amps. Now multiply by the voltage.
First answer;
80 amps x 220 volts / 1000 = 17.6 KVA.
However, you must use the same voltage that was used by the genset maker to rate the set.
If the set is for use in the NEMA world, it will be rated for 120/240 volts.
Second answer;
80 amps x 240 volts = 19.2 KVA.
Some loads draw a higher current at higher voltage levels. Often the current increase with higher voltage is linear.
If we adjust the current for a 240 volt supply, we get;
Third answer:
80 amps x 240 volts / 220 volts = 87.273 amps.
87.273 amps x 240 volts = 20.95 KVA

I would suggest adding at least 25% to the size of the genset, over the bare minimum.
That would be;
17.6 x 125% = 22 KVA
or
19.2 x 125% = 24 KVA
or
20.95 x 125% = 26.19 KVA
Your ultimate choice will depend on your assesment of your load current at the applied voltage and the sizes of gensets available.
It looks like your original three answers has expanded to six answers.
To quote Forrest Gump, "It Happens!"
yours

 

[itsmoked]

Not to mention you will probably need a very quiet generator! Think 'running generator at 3AM' - how loud? Look at "WhisperGen" or some other heavily silenced generator maker. Otherwise your generator may suffer "bullet poisoning"!

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[itsmoked]

And a last point!!

Generators are probably THE most stolen piece of heavy equipment. If it will be "out on its own" you really must take extraordinary measures to prevent it's guaranteed theft.

Suggestions:
Bury a large square pipe and use massive chain.
Use a protected lock.
Install a "Lojack" system.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[stevenal]

And a later last point. I imagine this device includes a motor driven air compressor. Generator must be able to provide the starting current for this motor. Most generator manufacturers have sizing guidelines based on continuous loads and the largest intermittent motor size.

 

[itsmoked]

A very good point too, stevenal !

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com